Process and apparatus for grinding rollers



April 6 1926.. v H. LUTZ IROGESS AND APPARATUS FOR GRINDING ROLLERS sSheets-Sheet 1 Filed May 29, 1919 l I I J All IL,

IN V EN TOR. f/ams A 0/2 ATTORNEY H. LUTZ PROCESS AND APPARATUS FORGRINDING ROLLERS Filed y 1919 s Sheets-Sheet 2 INVEN TOR. E H. #706 a ATTORNEY April 6 1926.

4 1579,83 3 H. LUTZ PROCESS AND APPARATUS FOR GRINDING ROLLERS Filed May29, 1919 6 5heets-'$heet 3 A TTORNEY H. LUTZ PROCESS AND APPARATUS FORGRINDING ROLLERS Filed May '29, 3.919

6 Sheets-Sheet 4 INVENTOR. Hey/76 Aufz if mam April 6 1926.

H. LUTZ PROCESS AND APPARATUS FOR GRINDING ROLL Filed May 29, 1919 6Sheets-Shem. 5

INVENTOR. l7'67f76 ALL/I22 @WA. A TTORN E Y H. LUTZ A ril 6 19261,579,876

PROCESS AND APPARATUS FOR GRINDING ROLLERS Filed May 29. 1919 6Sheets-Sheet 6 0 f 3 0 7 a ja INVEN TOR. fiams Z. ufz

HANS LUTZ, F ELIVIIRA, NEW YO RK, ASSIGNOR TO THE WILLYS-MORROW COMPANY,

OF ELMIRA, NEW YORK, A. CORPORATION OF OHIO.

PROCESS AND APPARATUS FOR GRINDING- ROLLERS.

Application filed May 29,

To all ioizio'zn it may concern.

Be it known that, I Hans Low, a citizen of the Unitetl i tates, residingat Elmira,

county of Chemung. State of New York,

have invented certain new and useful Improvcu'ients in Processes andApparatus for Grinding iiollers,"ot which l cleclare the foliowing to hea tull,= clear, and exact description.

This invention relates to an imi'iroved process and apparatus forgrinding rollers, particularly rollers adapted to be employed inConnection with roller bearings.

One object of. tliein'vention is to provide an improvedprocess'forgrinding rollers,

whereby the exterior surface of the rollers ar readily ground 'in such amanner, as to produce a substantially uniform exterior surface ofcylindricalStorm, all parts of which are synnnetrical with respect tothe axis of the roller.

AYturt-her object, of the invention is to provide an improved apparatusof the character ilescrihetl, which is of simple construetion amtilicicut in operation.

A vfurther object of the invention is to provide a. pair of grimilingsurfaces rotatable iiroppositc directions relatii 'e to each other andat lifl'ercnt speeds operable to p properly grind the exterior surfacesofthe bearing roliers.

A further objectoi'this invention is to provide a mechanism for grindingrollers -romprisin an upper and lower grinding surface and a worksupporting member in-' terposed there-between monntecl in such a manneras to be capable of movement in a patheccentric to the paths of movementof the grinding members.

Further objects of the invention relate to the provision. o't' improved.instrumentalities V and devices for securing a proper ope 'ation of thevarious mechanisms employeth 7 Further objects of the invention relatetoeconomies of mamitacture and details of; construction, willhereinafter appear] i'rom the detailed description trytollon'x 4 "heobjects of the inrenticm are accomi'fished in one instance by the(lm'ices and means ilescriheil in 'tiie'l ollowing specitiealion, hutitris evidcut that thesa-ine may he rocking lever 1919. SeriaiNo.300,712.

varied widely without departing from the scope of the invention, aspointed out in the appended claims. 7 1

A structure constituting one embodiment of the invention which may bethe preferred is illustrated in the accompanying drawings forn'iing apart.liereot,- in which:

, Fig. I isa side elevational View of the roller grinding mechanism,having a port-ion ot the casing broken away in order to betterillustrate the position of the operating parts.

Fig. II is a vertical-sectional view of the apparatus. iliustrating therelative position of the operating mechanism during the grindingoperation.

Fg. H1 a vertical sectional View of the apparatus; illustrating theposition of the upper grinding member When raised vertically from itsoperative position for the purpose of pcrn'iitting the removal and replacement of the rollers to be ground.

Fig. IV is a horizontal, sectional View,

taken along'the line IVIV of Figs. II and Ill, antl iilustrating theposition of the raising and lowering mechanism with respect to the,remaining parts of the structure.

Fig. V is a vertical sectional View, taken along the line V-Y of Fig;IV, and illustrating more in letail the mechanism for raising; andlower/pg the vertical shaft, and the upper grimliqg member securedthereto. Fig. VI is a t tail sectional-view taken along the'fline V VIof Fig. V; and illustrating the man er of mounting the clutch actuatingrockerarm."

1f i e: VII is taken along tl line VII-VII of Fig. V, anrlillustrating'lthe manner of mounting the Fi'gINIII is a top, plan Viewof the rotata ble Wdrli supporting member, illustrating the position. ofthe same with respect to the lower-{grinding member at one point'in itsrotatigve movement.

Fig. TX is a top; plan View of the; work supporting member, illustratingits position \vitl respect to. the lower grinding member at aidittercntperiod in the rotative moveinent otthe Work supporting member.

X is a detail horizontal, View, palhorizontal sectional View,

iii

iially in seciion. illustrating tine manner of rototably supporiing ofthe rollers 1c the work supporting member.

Xli is .1 detail vicvz.

tion, illustrating a form of 1p; mounting a smaller sized bearing rollerupon pot-l" bearings for tlie worl-z supporting By iho use of the meansemployed. up lo this time in the production of bearing rollus, it hasbeen extremely difiicuil und costly to produce bearing rollers whichwould satisfy the exaciing demands o; lie Erode for of this character.

The grinding of the exterior surfaces of flue rollers to give them 11lruc cylindrical form requires the utmost care in order to producerollers having the required precision and-uniformity of bearingsurfaces. and it is only by so most careful and skillful work that it ispossible to make rollers capable of marrying the rcouired loads. in hasbeen found limo by giving the rollers :1 rotaicive movemenoduring theoperaiion of grinding the exierior surface thereof be tween a pair ofgrinding members. and by simulfiuneousl imparling to lime rollersmovement in s direction :ei on angle to the oil of movement of linegrinding surfaces uring the grinding openution. lillB uni- 'formicy oftho finished producsv is increased to a considerable degree, while tilespcedoi production is at the some li e gmutlv mcrcased. By mounring onour supposing J member in such n msnner as to permit the some to moreindependently of lhe flipper and lower grindin members; and in directioneccentric to 518 poms oi n'iovei7lent of the Winding memlreis. therollers curried there 1}. are rotated during the grinding operation, andat the some time giveur i sliding movement in s direciion at an anglethe path of movement of the grinding mcmlsers m such a manner es loPlfit'lllffi issinii'orm and perfectly cylindrical em'eri or sui'iacefilrougliout file entire length of one l: Hiring member. and tireopcrsiion of the several parts of the mechanism is by lilliS arrang mentrendered automatic, and uniformity of the finished product is assured.Referring to the drawings similar refer ence characters designnle'wrresponding parts tlirouglioui; the m? views. and Kim sectionalviewssre size olircclion of the small crisis or the section lines inEire coils imied herewith,

' which frame of the machine. which may be formed of cnsi metalconstructed in such a manner as to provide suitably positioned bearingportions for the reception of-ihevarious 0peroting ports. The frameportion 1 is provided with an opening formed upon one side thereof insuch a manner as to permit ready access to the various parts of theoperating mechanism. these openings bein normally i the frame oppositelypositioned from out jusi described and provided with a hinged coverplate 5 similar in all respects to the cover and adapted to be retainedin closed posilion by means of a latch 6 which is capable of beingrotated by means of a knob 11'. By ineuns o'i the openings thusprovided, the various operating parts of the device positioned Withinthe main portion of the frame are readily accessible at all times forthe purpose of repair. I

The frame portion of the machine is provided with a substaniially.vertically posiiioned bearing portion 8. within which is revolvablvmounted a sleeve 9 extending beyond the end portions of the bearing 8.and having rotatably mounted thereupon at its upper exiiemifv uhevelcdpinion 10. The slceve 9 is provided at the upper end thereof with areduced portion 11. upon which the beveled gear 10 is rcvolvablymounted. and which serves to retain the bevel gear 10 in position toprevent downward movement tliezeof with respect to the sleeve 9.

.Slidably and revolvably mounted within the sleeve 9. is u substantiallyvertical shaft l2 provided with a central opening 13 formed in one endthereof, for a purpose will be hereinafter described. A hearing ii isformed in the frame portion above and substantially in veflicalalignment w th tlzc bearing 8 previously descrilied. and a sleeve 15 isromtablv posiiioned wiiliin the bearing 14. the sleeve 15 lieing ofsuiiicienl: length to extend both above and below the bearing 14. Keyedor G-Zl'lQiWizZQ firmly secured to the upper end of the sleeve 15 is aplate 16 adapted to opcrativeiy support cermin of the operatingmechanisms. Keyed or otherwise firmly secured in any suitable manner tothe lower end portion of the sleeve 15. is a beveled gear l? similur inall respects to the bevel gear 1% previously described Positioned aboveetlie nevel gosslll is a collar 18 surrounding we vertical shaft 12 andprovided with oppositely posiiioncd splines 19 adapted to excsimdioggrooves 2 3 upon epinto oppositely posisioned, longitudito permit thesame to rotate freely, and l1)" opening. are adapted to be positionedwithin the cover plntefit' in such a manner as to bear against the uppersurface of the annular flange 59 formed upon the sleeve 55. and thusgive added eight to the upper grind ing ring or lticlllliwl lit. in sucha manner to properly force'tlie grinding surfaces into contact with thehearing rollers which are to be ground and polished.

A work supporting member 2 of substantially circular form. is secured toa dished plate 63 by means of a plurality of screws or other suitablefastening means M. the dished plate 63 being provided with an openingformed substantially centrally thereof and provided with internalthreads in such a manner as to receive an externally threaded cup-shapedmember fif therein. the dished member 63 being capable of verticaladjustment with respect to the cup-sha 'ied nicmber 65 and being adaptedto ht retained in a plurality of adjusted positions relative thereto bylll(2lll of a plurality of clamping screws 165. The work retain i memberis mounted upon and rotatably supported by the lower plate 16, in amanner which will now be described. A lower bearing ring 65 is providedupon its undeIfaJe with a circular groove 66 within which the uppercircular portion of the plate 16 adapted to fit in such a manner tosupport the ring 65' upon the plate It and concentric with the axis ofthe vertical shaft 12. The plate 65 is provided with an anti-frictionhearing 61', the lower member of which is positioned within a groove 6?formed in the upper surface of the plate 65, and located in sucha manneras to be concentrically positioned with respect to the axis of the shaft12. A hearing plate 69 is supported by the upper member of theanti-friction bearing 67 and this plate 6.) in turn provided with ananti-friction bearing TO formed upon the upper surface thereof andpositioned in such a manner as to he eccentric to the anti frictionbearing 68 and the axis of the vertical shaft 1:2. surface of theanti-friction bearing 70 is a third supporting plate 7:2. which in turnprovided with an anti-friction liiearing F3 sitioned upon the upper facethereof and iiiated eccentrically with respect to the bearings 68 andF0. The upper ring of the bearing '53 fits withina groove formed uponthe'underface of the cup shaped member 6.3 and'is concentricallypositioned with respect to the circular opening formed in the cup shapedmember. and also with respe t to the circular work supporting melnl'icr62. iThe Fork supporting ineniherlfiii therefore-s1; p. ported b v theplate 16 in uch a manner as reason of the eccentric-ally positionedamifriction bearing. the work supporting membar 62 together with thebearingtollers carlositioned upon the upperthe dished plate 63 withrespect to the vertical shaft 1:2 and the grinding members, while theamount of displacement of each of thc anti-friction bearings relative tothe next lower bearing is so slight as to not materially affect thestability of the support given the dished plate 63 by the bearings.

An outwardly extending annular flange T5 formed upon the lower endportion of the sleeve 9. and the collar 76 is provided with an upwardlyextending annular flange 7?. which abuts against the annular flange T5and is firmly secured thereto by means of a plurality of screws orsimilar fastening means 78. Rotatably mounted upon the outer surface ofthe collar 76 is'a gear 79, which is held against removal from thecollar by means of a ring 80 secured to the collar by a key 81. The gear79 is provided with a downwardly extending cylindrical portion providedwith an outwardly extending flange 83 formed upon the lower endflier-20L A plate 84: provided with a central opening formed therein hasits edge portion secured to the outwardly extending flange 83 by means.of screws or other suitable fastening means 85. A clutch member 86 ishoused within the space formed by the downwardly extending cylindricalportion 822 formed upon the gear and the plate 84. and this clutchmember is provided with a cylindrical portion 8.? extending through thecentral opening formed in the plate 84 and provided upon its outersurface with an annular groove 88 for a purpose which will behereinafter described; Slidably but nonrotatabl mounted within thecylindrical portion 8? of the clutch member and extending upwardlytherefrom is a shaft 89, which is rotatably mounted within the collar 76and extends upwardly therefrom substantially concentric with thevertical shaft 12. The-upper portion of the vertical shaft 89 isprovided with an enlarged portion 90 having exterior threads formedthereon which are adapted to engage with an internally threaded collar9l, positioned within the central opening formed in the-end of the lowerend of the enlarged portion 90 of the shaft 89. 950i leather brothersuitable material is positioned within an annular groove 96 formed uponthe upper surface of the plate 8%, andlo'ca ted in such a manner as toserve as a friction means for engagement by the under surface of theclutch member Means which will be hereinafter described is provided fordraw ing the "clutch member 86 downwardly into close engagement with theupper surface of the ring 95 in such a manner as to cause the clutchmember 86 to be rotated through rotation-of the gear 7 9,-wherebv thevertical shaft 89 will be rotated, thus causing the internally threadedcollar 91 carried by the vertical shaft 12 to be raisedv or lowered,depending upon the direction of rotation of 4 the Eli-#13 89, and thusraisingor lowering the vertical shaft 12 since the vertical shaft isheld from rotation relative to the; collar- -18 by means of theoppositely positioned splines 19 cooperating with the grooves 20 formedupon opposite sides of the'vertical' shaft-12. v

A. suitable opening 97 is formed in the cast frame member l within whichis positioned a bearing sleeve 98 provided with an inwardly extending.bracket portion 99, the said bearing sleeve bein' adapted to be held Yin position relativeto tie frame portion by means of a plurality ofscrews or other suitable fastening means 100. Rotatably y mounted withinthe bearing sleeve 98 is a p to shaft 101 to one end of which is secureda bevelge'ar 102, while a hand wheel 103 is non-rotatably secured to theopposite end of the shaft. A vertical shaft 104 has its upper endportion rotatably mounted within the bracket 99 while the lower endportion thereof is rotatably mounted in and held in position by abracket 10!), which may be sorured in place relative to the frameportion of the machine by means of attaching screws 106. Firmly securedtothe shaft 10st in such a manner as to mesh "with the gear 102 is abevel gear 107 whereby the shaft 104 is rotated. upon rotation ofthehand wheel 103.

Firmly secured to the lowerjend portion of the shaft 10% is a gear 3.08meshing with the gear 7 9 previously described, and adapted toimpart-rotation thereto by reason of i the rotative movement given tothe shaft 10%: A lever 110 isjfulcruined upon a downwardly extendingportion of the bracket 105 as at 111 and the inner end portion thereofisprovided with a pan of forked arms 1.12, provided with inwardlyextending lugs 113 positioned within the groove 88 formed upon. thedownwardly extending cylindrical port-ion 87 of the clutch member 86. Alink 115 is pivotally connected to the bpposite end of the lever 110 asat 116 and extends upwardly therefrom being pivotally connected at 117to a collar 118, mounted upon the bearing sleeve 98 and provided with anactuating lever 119 positioned ad illustrated 1' acent the hand wheel103. It will beevident from the above description that when it isdesired to raise the vertical shaft 12 for the purpose of withdrawingthe hearing rollers upon the completion of the grinding and. polishingoperation, the lever 119 is actuated thus rocking-thelever 110 throughtation is imparted to the shaft 104 and through the gears 108 and 79 tothe clutch member 86, thus rotating the vertical shaft 89' in such amanner as to cause the vertical shaft.,12- andthe upper grinding membercarriedthereby to be raised by reason of the internally threaded sleeve91 traveling upon the enlarged exteriorly threaded portion 90 of theshaft 89. r w

The manner of mounting the bearing rollers upon the work retaining ringor member in such a manner as to permit the op posite edges thereof tobe engaged by .the oppositely positioned grinding surfaces is in detailin Figs. X, Xi and XII, and will now be described. The work suppbrtingring or member 62 is prbvided with a plurality of circular openings 120as illustrated in Figs. VIII and IX, the circular openings being sopositioned as to lie in a path concentric with the outer edge of thering 62, and these circular openings are preferably spaced a substantialdistance from each other so as to cause a uniform grinding action to beexerted upon the several bearing rollers. it is evident that variousmeans may be employed for supporting the rollers in position relative tothe openings 120 and a simple and etlicient form of supporting means isillustrated in Figs. X and XI which is capable of being readily adaptedto support rollers of different lengths in proper position relative tothe grinding apparatus.

In 1* lg. X. there is illustrated a work sueporting member 121 which issecured to tie plate 62 by means of screws The memher 121 is providedwith a longitudinal opening123 formed therein for the purpose permittinga portion of the bearing roller to extend beneath the plate a sufficientd1sfence to contact with the surface of the lower grinding member 43.Positioned at opposite ends of the longitudinal opening 123 are upwardlyextending slotted standards 124:, which may, if desired, be formedintegral with the member 121, and which are located a sufficientdistance from each other to accon'nnodate a bearing roller of the sizewhich it is desired to grind. A bar 125 rovided with flattened ends 126is carried 'y the standards 124., the flattened ends 126 being adaptedto tit within the slots formed in the standards in such a manner as toposition the bar so that it is at all times parallel to the plane of thering as. thus permitting the roller A within which the bar 12:5 isinserted to be carried insucit maiiner that itwill remain at all timesparallel to the plane of the ring t'rl.

In Fig. XI of the drawings is illustrated a modified form of support forone of the rollas which comprises a supporting member 12? adapted to bsecured to the ring 652 by means of screws 12$. and which is providetwith a longitudinally extending opening 129 for the reception of theroller A. A pair of upwardly extending slotted standards 130 arepositioned at opposite ends of the opening 12 in such a manner as tocarry a rod 131 provided with flattened ends 132. The supporting memberand its associated parts as illustrated in Fig. X1 is similar in allrespects to that shown in Fig. X except for the fact thatthis supportingmembe is constructed so as to accommodate a bearing roller of smallersize than that with which the supporting member illustrated in X isadapted to be used. It is clear from the structure shown in Figs. K. XIand Bill that the only change necessary to be made in adapting thisdevice for u in connection with rollers of ditferent sizes substitutesupporting members of proper size for tie-- commodating the rollerswhich it is desitcd to grind for those pr viously used. where upon theprocess of grinding the rollers may be continued in the usual manner.

The cast frame portion 1 of the machine is provided with an outwardlyextending ledge 13a near the upper end thereof to which is secured in ansuitable manner as by a plurality of bolts 135 an annular trough member136 which is adapted to catch the lubricai'itapplied to the bearingrollers during the grinding operation and discharge the same through aspout 13'? into a suitable receptacle which may be attached to the spoutby having a portion thereof engaging in a slot- 138 formed in the spout.

Secured to a side portion of .the cast frame 1 is an offset bracket l-lOto which is pivoted at 111 a control lever 1-551 provided with a pair offorked arms 1-1 3 adapted for engagement with the power belt. and havinga hand grip 114 by which the same may be actuated for the purpose ofmoving the power belt from the fixed pulley to the loose pulley or viceversa as occasion may require. A11 outwardly extending bracket member1-15 formed integral with or secured to the cast frame in any desiredmanner carries a segment 116 which is adapted to control the movement ofthe shifting lever 1&2 in such a manner as to control the direction ofmovement of the forked arms 113 for the purpose of properly actuatingthe power belt.

will be evident from the above desc' tion that by of the apparatusherein described plurality of roller bearings may be ground and polishedsimultaneously, in such a manner as to give the'same a pen feetcylindrical form wherein inaccuracies and imperfections in the grindingsurfaces are eliminated and a uniform and perfect bearing prtaluccd.When power is applied to the pulley ill from the driving belt the shaft:3: is rotated together with the gear 31 and the bevel pinion 36 carriedthereby. As the gear 23% meshes with the gear 35 secured to the shaft L?rotative movement is simultaneouslv imparted to the bevel gear 3?whereby the bevel gears 10 and I? are simultaneously rotated in oppositedirections and at tliii'erent speeds. 'l he gear 35 being of largerdiameter than the gear 34:. the shaft 27 will be rotated at aconsiderably lower rate of speed than the. shaft 2S and the gears 35 and'27 being of substantially equal size the gears 10 and 1? will berotated at; different speeds thus resulting in rotating the lowergrinding member 113 actuated by the gear 12' at a considerably greaterspeed than the upper grinding niember'i) actuated by the gear 10. It. isto be understood that the relative size of the gears 3-} and 35 nia bevaried as. desired thus giving one of the grinding! surfaces at greateror less speed of rotation relative to the other. or if desired the gear3% may he (OXISU'UCIQd of larger diameter than the gear 35 thusimparting to the upper grinding surface -19 a higher speed of rotationthan that given to the lower grinding surface 13. It will be noted thatthe lower grinding member 43 is firmly secured to the upper end portionof the sleeve 15 while the bevel gear 17 is firmly attached to the lowerend portion of the sleeve thus insuring rotative movement of the lowergrinding members upon rotation of the gear 17. the bevel gear 14) isfirmly secured to the collar 19 which is in turn slidably andnonrotatabl carriedby the vertical shaft 12 thus causing rotativemovement to be imparted to the vertical shaft 12 and to the uppergrinding member -19 upon rotation of the gear 10. while permittinL'vertical movenient of the shaft 12 relative to the gear 10 and thecollar 1*. Since the upper and lower grinding members are thus adaptedto be rotatedin opposite directions and at difierent speeds. and thework retainingmember 6;. is mounted in such a manner as to diminish to aconsiderable degree the frictional resistance to the rotative movementof the work retaining member. the frictional resistance between therotating bearingsand the more rapidly rotating upper grinding memberwill cause rotation of the work retaining member at a rate of speeddepend. mg upon the dificrcncc between the speed of As previouslypointed out 1 gamers relative to the longitudinal axes of the grindingrollers. By the provision of the -weights 60 which may be varied innumber as, maybe found desirable, the upper and lower grinding membersmaybe forced more or less firmly into contactwith the opposite sides ofthe rollers thus increasing or decreasing the grinding action as may befound desirable. The provision of the cap 52 and the ad'ustin screw 54arovide means for,

adjusting the upper grinding member ver tically with respect to theshaft12 so as to take upanywear upon the grinding surfaces and providemeans for insuring contact at all times between the surfaces of thegrinding members and the rollers which are "to be ground. 1 i

lVhen it is found-desirable to remove the rollers and replace them withothers after the completion of the grinding operation the VII.

relative rot-ationof the grinding members is stopped by throwing thepower belt from the pulley 31 to the loose pulley 32 by operatingthecontrol lever 142, whereupon the upper grinding member may be raisedto the .pbsitionillustrated in Fig. III by means 01' the mechanism shownin Figs. IV, V, VI and After the power has been disconnected from thegrinding members the handle 119 is actuated for the purpose at rockingthe lever 110 in such a manner as to force the tical shaft 89non-rotatably connected thereto thus causing the vertical shaft 12 to beraised by reason of. the internal threads formed upon the sleeve 91(to-operating with the threaded portion 90 of the vertical shaft 89. Theshaft- 12 is retained against rota- "tive movement by reason of theoppositely positioned grooves formed therein co-operatmg with theoppositely positioned splines l9 carriedby the collar 18. After theupper grinding member has been raised to the desired height the rollerspreviously treated are rei'nov'e'dnnd replaced by others which are to;be (pi and whereupon the vertical ried thereby ai permitted to returntotheir .original posi,

per surfaces of the rollers. o l-t will be ob n into contact with theupthe upper grinding member car served that the roller supportingmembers 121 and 12? are positioned at an angle to the circumference of acircle passing through the centers of the small circular openings 120,thus resulting in' a rot'ative movement of the rollers upon their axesand a slidable movement of the same in a direction at an angle to theirlongitudinal axes as-tlie roller supporting plate 62 moves eccentricallyto $16 path of movement of the grinding memers.

It will be observed that Figs. lland XIII [disclose modified forms ofsupporting .bearings for the work supporting member since in Fig. '11three anti-friction bearings are employed for supporting the workholding member while in Fig. XIII" only two of these anti-frictionbearings are used. Any desired number of these anti-friction bearingsmay, beqemployed and the extent which adjacent bearings are offset fromeach other may. be varied with theuiumber of bearings employedso as tosecure a proper degree of eccentricity ot'fthe work supporting memberrelative to the grinding members.

While I have shown and described in considerable detail the specificembodiment of my invention, it is to be understood that this showing anddescription is illustrative only and for the purpose of renderingmyinvention more clear, and that I do not regard the invention aslimited to the details of 0011- struetion illustrated or described, norany of them, except in so far as'l have included such limitations withinthe terms of the following claims, in which it is 'my intention to claimall novelty inherent in my invention broadly as well as specifically.

What 1' claim as new and desire to secure rollers a inorement toward andfrom the axis about which the surfaces are rotated and eccentric to thepathsof the rotating surfaces.

3. The process of grinding the curved faces of rollers between rotatingsurfaces comprising the positioning of the rollers angularly withrespect to the path of mm e-- i'nont of the rotating surfaces, and Sunnitaneously imip'arting to the rollers a circular andback and forthmovement toward and 4. The process of eylindrically grinding rollersbetween grinding surfaces rotatrng 3 emma i in opposite directions,comprising the im ported thereby parting of a back and forth movement tothe rollers in a circular direction about the axis of rotation of thegrinding surfaces.

5. The process of cylindrically grinding the curved faces of a roller byrotating the roller and subjecting it to grinding action at an angle tothe direction of rotation and simultaneously moving it back and forthwhile rotating.

6. The process of grinding a roller by simultaneously rotating theroller, moving it back and forth in a direction at an acute angle to itsaxis of rotation, and subjecting it to grinding action.

'5'. In a device of the clam described, a pair of oppositely rotatablegrinding mem bers, a roller retaining having a portion thereof extendingbetween the grinding surfaces and mounted to move in a directioneccentric to the path oi movement of the grinding members, and rollerscarried by said retaining ring and rotatably supwith their axes parallelto the face of a grindin member.

8. In a roller grin 'ng mechanism, upper and lower grinding members,movable in opposite directions relative to each other, a rollerretaining ring having a portion thereof extending between the adjacentsurfaces of the grinding members, and means carried by the retainingring for rotatably supporting the rollers, with their cylindricalsurfaces in contact with a grinding member.

9. In a device of the class described, upper and lower grindingelements, a work supporting member therebetween, means for rotating.said upper member and means whereby the rotative movement of said uppermember may be made effective to raise the same from said lower member.

10. In a device of the class described, upper and lower grindingmembers, means for rotating said grinding members in op positedirections, relative to each other at difi'erent speeds. and meanscoaxial with the grinding members for displacing. one of the grindingmembers relative to the other.

11. In a device of the class described, upper and lower grinding membershaving a common axis of rotation, means for rotating said grindingmembers in opposite directions relative to each other, and means coaxialwith the common axis of the grinding members for displacing one of thegrindin-g members relative to the other in an axial direction.-

12. In a device of the class described, upper and lower grinding membershaving a common axis of rotation. means for rotating said grindingmembers at different speeds relative to each other. and means coaxialwith the common axis of the grinding members for displacing one of thegrindan upper member carried by said ing members relative to the otherin an axial direction.

13. In a roller grinding machine, a pair of opposed relatively rotatablegrinding members, an intermediate roller carrying member. means forrotatively mounting a lurality of rollers on said carrying membe! andmeans for mounting said carrying member to be freely rotatable in a patheccentric to said grinding meu'ibers.

, 14. In a device of the class described, a grinding member rotatableabout a substantially vertical axis, a member freely mountedfor-eccentric movement about the axis of the grinding member, means forrotatively mounting a roller in said member and means for impartingmovement to said member relative to the grinding member.

15. In 2' device of the class described. a lower grinding member. anupper grinding member, a work supporting member having a portionextending between the grinding members. and meaus'for mounting the worksupporting member for free movement, in a path eccentric to the grindingmembers.

16. In a device of the class described. a lower grinding member and anupper grind big member having a common axis of rotation, a worksupporting member having a portion extending between the grindingmembers and adapted to prevent vertical displacement of the work, andmeans for rotating the grinding members at different speeds.

17. In a device of the class described, a substantially vertical shaft,a lower memher, an upper member carried by said shaft, and meanscomprising a threaded member operated by said shaft for bodily raisingthe first named shaft, and the member carried thereby.

18. In a.device of the class described, a substantially vertical-shaft,a lower rotatable member, the axis of rotation of which coincides withthe axis of the vertical shaft, an upper member carried by said shaft.and screw threaded means carried by said shaft for automatically raisingthe shaft and the member carried thereby.

19. In a device of the class described. a substantially vertical shaft.a -lower rotatable member the axis of rotation of which coincides withthe axis of the vertical shaft, shaft, means for rotating the shaft andthe lower member, and means responsive to the relative movement of theshaft and the lower member for raising the shaft and the member carriedthereby.

20. In a device of the class described. a substantially vertical shaft,:1 lower rotatable member the axis of rotation of which coincides withthe axis of the vertical shaft, an upper member carried by said shaft.:1 work supporting member positioned between the upper and lowermembers, means for rotating the upper andlower members, and

means operatively connecting said shaft and said lower member forautomatically raising the shaft and the member carried thereby.

21. In a device of the class described, an upper rotatable member, alower rotatable member, and a rotatable -work supportin memberpositioned between the first named rotatable members andprovided withbearings offset from each other whereby thesup- -porting member is givenan eccentr c movement as it is rotated.

22, In a device of the class described, a

substantially vertical rotatable shaft, a lo tatable work supportingmember, and a plurality of bearings. for said supporting. memthesupporting member to move eccentrically ber lconcentri'c respectivelywith said shaft andwith said supporting member and offset from eachother in such a manner as to cause when it is rotated relative to theshaft.

23. In a device of'thc class described, a

lower grinding element, ,an upper rinding element, a shaft for rotatlngsaid upper grindingelement, threaded means operatively connected withsaid shaft for raising said upper member and a clutchdevice forrendering operative said threaded means.

'24. In a device of the class described, a

substantially vertical'shaft, a rotatable work support-ing member, a'bearing concentric with the shaft, a second bearing ofi'set from thefirst named bearing,and meansfor supporting the said member u onthesecond named bearing whereby t e supporting member moveseccentrically' w th respect to the shaft as it is rotated.

25. In a device of the class described, a- I lower grinding member,upper grinding member, a shaft for eachof said members,

single means for rotating said shafts in opposite directions, andmeansfor interconnecting said shaftsfor automatically raising said u permember.

26 In a device of the class described, a

ture.

work supporting member comprising a. central portion and an outer ringportion, and

means carried by the ring portion for sup portin" a plurality of bearingrollers. 27. 11 a device of the class described, a work supportingmember provided with a plurality of openin s therein, and. meansmounting roller beatings in certain of .the

openings in such a manner that the 'longi- V tudinal axis of each rollerwill be positioned a-ngularly with respect to a radial line to saidroller; i

29. In a device of the class described, a

lower grinding member, an upper rinding member, a work supporting mem erprovided w th a plurality of openings formedtherein in such amanner asto be ositioned bers, and bearing rollers positioned within certain ofthe openings in such a manner as to contact with the upper andlowergrinding members.

class described, a

substantially vertical sh ft, means for rotat- 4 30. In a device of ingthe shaft, and me ns for raising and loweringthe shaft, and clutch meansfor operatively connecting the raising and lowering means withthe'operating mechanism therefor. v

'31. In a device of the class described, a

substantially vertical shaft, a .threaded shaft co-eperating with thefirst named shaft :tor raising and lowering the same, means for rotatingthe threaded shaft, and clutch means for connecting the operating meansfor the threaded shaft thereto and discon-' necting the same therefrom.

In testimony HANS LUTZ.

whereof, I afiix my signa- 70. between the'upper and lower grin ing memi

